Surveillance results of foodborne diseases in Huzhou, Zhejiang, 2018–2020

  Objective   To discuss the infection status and epidemiological characteristics of foodborne diseases in Huzhou of Zhejiang province.

  Methods   The Salmonella, Vibrio parahaemolyticus, diarrheogenic Escherichia coli strains from 6 sentinel hospitals (3 key surveillance points and 3 routine surveillance points) in Huzhou from 2018 to 2020 were used for serotyping and virulence gene detection;Real-time PCR was conducted for the nucleic acid detection of norovirus.

  Results   A total of 6783 samples of diarrhea cases were detected, and 1373 were pathogen positive, with a detection rate of 20.24%. The detection rate of diarrheogenic E. coli was 6.49%, mainly enteroaggregative E. coli and enterotoxigenic E. coli. The detection rate of V. parahaemolyticus was 5.31%, the main serotype was O3∶K6, and the main virulence genotype was tdh. The detection rate of Salmonella was 2.85%, with S. typhimurium as the main species. The positive rate of norovirus was 11.65%, and the genotype was mainly GⅡ.2［P16］. The incidence peak of pathogenic bacteria infection was in summer, and the incidence peak of norovirus infection was in winter and spring, and people aged 20–39 years were mostly affected.

  Conclusion   The pathogens causing infectious diarrhea in Huzhou from 2018 to 2020 were norovirus, diarrheogenic E. coli, V. parahaemolyticus and Salmonella, and the infection incidence showed obvious seasonal and age distributions. The surveillance for foodborne pathogens should be strengthened to effectively prevent and control the incidence of foodborne diseases.